W. Wyatt Oswald, Laura E. Conkey, Daniel G. Gavin, Christine L. Goodale, Jed O. Kaplan
Historic harvesting and mortality from air pollution drastically reduced the abundance of red spruce (Picea rubens), a late-successional dominant of cool-temperate forests of the northeastern U.S. and southeastern Canada, leaving few opportunities to understand the natural growth and disturbance responses of this species. Timbers salvaged from the Moosilauke Ravine Lodge, a structure built from trees harvested in the late 1930s, provided an opportunity to reconstruct radial growth patterns and dynamics of a former old-growth red spruce stand located in Jobildunc Ravine on Mount Moosilauke in the White Mountains of New Hampshire. Ravine Lodge tree-ring series were compared with data from a 255-year-old red spruce found living in Jobildunc Ravine, from the Nancy Brook site in the White Mountains, and from other dendroecological studies across the region. Ring counts provide minimum tree ages of 187–286 years for timbers from Jobildunc Ravine, suggesting they established between the mid-Seventeenth and mid-Eighteenth Centuries. Dendroecological analyses identified early decades of suppression in the understory followed by 2–5 growth releases and 2–4 growth declines for each sample, indicating occasional, small-scale disturbances of the canopy before the 1930s. A growth decline in 1834–1835 coincides with an outbreak of spruce budworm (Choristoneura fumiferana) in eastern Canada, perhaps reflecting a regional defoliation event that occurred as far south as Mount Moosilauke. This study illustrates the insights that can be gained from wood from historic structures on the dynamics of now-scarce old-growth red spruce forests.
{"title":"Tree-ring analysis of red spruce timbers from the Moosilauke Ravine Lodge, White Mountains, New Hampshire","authors":"W. Wyatt Oswald, Laura E. Conkey, Daniel G. Gavin, Christine L. Goodale, Jed O. Kaplan","doi":"10.3959/trr2023-7","DOIUrl":"https://doi.org/10.3959/trr2023-7","url":null,"abstract":"<p>Historic harvesting and mortality from air pollution drastically reduced the abundance of red spruce <em>(Picea rubens)</em>, a late-successional dominant of cool-temperate forests of the northeastern U.S. and southeastern Canada, leaving few opportunities to understand the natural growth and disturbance responses of this species. Timbers salvaged from the Moosilauke Ravine Lodge, a structure built from trees harvested in the late 1930s, provided an opportunity to reconstruct radial growth patterns and dynamics of a former old-growth red spruce stand located in Jobildunc Ravine on Mount Moosilauke in the White Mountains of New Hampshire. Ravine Lodge tree-ring series were compared with data from a 255-year-old red spruce found living in Jobildunc Ravine, from the Nancy Brook site in the White Mountains, and from other dendroecological studies across the region. Ring counts provide minimum tree ages of 187–286 years for timbers from Jobildunc Ravine, suggesting they established between the mid-Seventeenth and mid-Eighteenth Centuries. Dendroecological analyses identified early decades of suppression in the understory followed by 2–5 growth releases and 2–4 growth declines for each sample, indicating occasional, small-scale disturbances of the canopy before the 1930s. A growth decline in 1834–1835 coincides with an outbreak of spruce budworm (<em>Choristoneura fumiferana</em>) in eastern Canada, perhaps reflecting a regional defoliation event that occurred as far south as Mount Moosilauke. This study illustrates the insights that can be gained from wood from historic structures on the dynamics of now-scarce old-growth red spruce forests.</p>","PeriodicalId":54416,"journal":{"name":"Tree-Ring Research","volume":"23 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
John Risley, Dalila Kherchouche, Said Slimani, Mehvish Majeed, Sahar Abidi, Safia Belhadj, Ammar Menasri, Sohaib Muhammad, Refad Y. Al-khawalaldah, Ramzi Touchan, David M. Meko
An international summer course in dendrochronology, ‘‘Tree Rings, Climate, Natural Resources, and Human Interaction’’, was held in Amman, Jordan, in summer 2023. Drs. Ramzi Touchan and David M. Meko from the University of Arizona Laboratory of Tree-Ring Research were course instructors. The course, with 10 students from Jordan, Algeria, Tunisia, Pakistan, Greece, and the USA, included training in core-sample collection, sample preparation, crossdating, detrending, and climate signal identification. Students applied their training in group precipitation reconstruction projects. Fifty-two Pinus halepensis core samples were collected at Dibeen Forest Reserve, Jordan, which were used to develop a tree-ring chronology (1925–2022) and then used for the reconstruction models. Two reconstructions extended precipitation for Dibeen using: (1) measured October-April precipitation data (R2adj. = 0.63), and (2) gridded November-April precipitation data (R2adj. = 0.61). A third reconstruction used the Dibeen chronology and three low-elevation tree-ring chronologies in Cyprus to extend gridded December–April precipitation data for the eastern Mediterranean region (R2adj. = 0.55). Results from the class projects demonstrated the success of reconstruction techniques in regions with sparse measured climate data and tree-ring chronologies. Future training classes in these regions will also promote the importance of understanding historic climate variability, which is essential for water resource managers and planners.
{"title":"Precipitation reconstruction using tree-ring chronologies from Jordan and the Eastern Mediterranean Region","authors":"John Risley, Dalila Kherchouche, Said Slimani, Mehvish Majeed, Sahar Abidi, Safia Belhadj, Ammar Menasri, Sohaib Muhammad, Refad Y. Al-khawalaldah, Ramzi Touchan, David M. Meko","doi":"10.3959/trr2023-09","DOIUrl":"https://doi.org/10.3959/trr2023-09","url":null,"abstract":"<p>An international summer course in dendrochronology, ‘‘Tree Rings, Climate, Natural Resources, and Human Interaction’’, was held in Amman, Jordan, in summer 2023. Drs. Ramzi Touchan and David M. Meko from the University of Arizona Laboratory of Tree-Ring Research were course instructors. The course, with 10 students from Jordan, Algeria, Tunisia, Pakistan, Greece, and the USA, included training in core-sample collection, sample preparation, crossdating, detrending, and climate signal identification. Students applied their training in group precipitation reconstruction projects. Fifty-two <em>Pinus halepensis</em> core samples were collected at Dibeen Forest Reserve, Jordan, which were used to develop a tree-ring chronology (1925–2022) and then used for the reconstruction models. Two reconstructions extended precipitation for Dibeen using: (1) measured October-April precipitation data (R<sup>2</sup>adj. = 0.63), and (2) gridded November-April precipitation data (R<sup>2</sup>adj. = 0.61). A third reconstruction used the Dibeen chronology and three low-elevation tree-ring chronologies in Cyprus to extend gridded December–April precipitation data for the eastern Mediterranean region (R<sup>2</sup>adj. = 0.55). Results from the class projects demonstrated the success of reconstruction techniques in regions with sparse measured climate data and tree-ring chronologies. Future training classes in these regions will also promote the importance of understanding historic climate variability, which is essential for water resource managers and planners.</p>","PeriodicalId":54416,"journal":{"name":"Tree-Ring Research","volume":"16 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mehvish Majeed, E. Stoica, D. Meko, R. Touchan, F. Sivrikaya, Alin Alexandru, Laia Casanovas Arimon, Revaz Kvaratskhelia, Sophio Maglakelidze, Joren Mundane Pacaldo, Deeksha
ABSTRACT Black pine (Pinus nigra) is a widely distributed tree species across southern Europe and Asia Minor. This article summarizes a dendroclimatological study of subannual P. nigra ring width conducted during an international summer course “Tree Rings, Climate, Natural Resources, and Human Interaction” in 2022. Increment cores were collected from 15 young (oldest 105 years) P. nigra trees in the Araç Forest District in Kastamonu Province, Turkey. Site chronologies of earlywood (EW) and latewood (LW) width were developed to investigate climatic signals using correlation analysis. Results show that EW and LW chronologies are significantly correlated with one another (r = 0.56, n = 105, p < 0.001) and positively correlated with precipitation in the months April–September of the growth year. The month of strongest correlation shifts from April for EW to July for LW. Analysis of seasonally aggregated climate data further shows that EW but not LW responds positively to precipitation in the preceding summer (July–September). These results suggest that future tree-ring studies aimed at tree-growth impact of climate change in the Black Sea region of Turkey exploit the climate signal in subannual ring widths of P. nigra.
黑松(Pinus nigra)是一种广泛分布于南欧和小亚细亚的树种。本文总结了在2022年“树木年轮、气候、自然资源和人类相互作用”国际夏季课程中对黑桫椤年轮宽度进行的树木气候学研究。从土耳其Kastamonu省Araç林区的15棵幼树(最老105年)中收集了增加岩心。利用相关分析，建立了早木(EW)和晚木(LW)宽度的遗址年表，以研究气候信号。结果表明:生长期4 ~ 9月EW和LW年代学呈显著相关(r = 0.56, n = 105, p < 0.001)，且与降水量呈正相关。东西向相关性最强的月份由4月移至7月。季节汇总气候资料分析进一步表明，在前一个夏季(7 - 9月)，EW对降水有显著的响应，LW对降水没有显著的响应。这些结果表明，未来针对土耳其黑海地区气候变化对树木生长影响的树木年轮研究可以利用黑松年轮宽度的气候信号。
{"title":"Analysis of the Climate Signal in Subannual Width Measurements of Pinus nigra Tree Rings in Kastamonu Province, Turkey","authors":"Mehvish Majeed, E. Stoica, D. Meko, R. Touchan, F. Sivrikaya, Alin Alexandru, Laia Casanovas Arimon, Revaz Kvaratskhelia, Sophio Maglakelidze, Joren Mundane Pacaldo, Deeksha","doi":"10.3959/2022-12","DOIUrl":"https://doi.org/10.3959/2022-12","url":null,"abstract":"ABSTRACT Black pine (Pinus nigra) is a widely distributed tree species across southern Europe and Asia Minor. This article summarizes a dendroclimatological study of subannual P. nigra ring width conducted during an international summer course “Tree Rings, Climate, Natural Resources, and Human Interaction” in 2022. Increment cores were collected from 15 young (oldest 105 years) P. nigra trees in the Araç Forest District in Kastamonu Province, Turkey. Site chronologies of earlywood (EW) and latewood (LW) width were developed to investigate climatic signals using correlation analysis. Results show that EW and LW chronologies are significantly correlated with one another (r = 0.56, n = 105, p < 0.001) and positively correlated with precipitation in the months April–September of the growth year. The month of strongest correlation shifts from April for EW to July for LW. Analysis of seasonally aggregated climate data further shows that EW but not LW responds positively to precipitation in the preceding summer (July–September). These results suggest that future tree-ring studies aimed at tree-growth impact of climate change in the Black Sea region of Turkey exploit the climate signal in subannual ring widths of P. nigra.","PeriodicalId":54416,"journal":{"name":"Tree-Ring Research","volume":"79 1","pages":"50 - 59"},"PeriodicalIF":1.6,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44451280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT The pristine forest of Bhutan offers valuable prospects for dendrochronological research, which involves investigating past weather conditions and examining how trees grow and regenerate to support the development of sustainable forest management practices. This review presents the dendrochronological research conducted in Bhutan using available literature with the aim to determine the potential of tree species for climate or forest ecological studies and to identify gaps by comparing the methodology, collaboration, and prospects. Based on the systematic review of tree-ring research literature and studies conducted in Bhutan from the 2002 to January 2023, the search yielded a total of 36 dendrochronological studies in Bhutan. Bhutan's first tree-ring research publication studied the relationship between three pine ring-width chronologies and temperature. Bhutan's longest-known tree-ring chronology of 638 years (A.D. 1376 to 2013) from Eastern Himalayan spruce (Picea spinulosa) was used for seasonal and annual temperature reconstructions. Many other tree species of temperate conifer and broadleaved forests are continuously being discovered as potential candidates for use in climate and ecology work in Bhutan. Our review identifies that both national and international collaborations are necessary to conduct robust studies spanning different aspects of dendrochronology including dendrogeomorphology, dendroglaciology, dendroentomology, and dendroseismology to contribute to science and informed decision-making.
{"title":"A Review of the Current State and Future Prospects of Dendrochronological Research in Bhutan","authors":"Chungdu Tshering, K. Tenzin, Thiet V. Nguyen","doi":"10.3959/2022-6","DOIUrl":"https://doi.org/10.3959/2022-6","url":null,"abstract":"ABSTRACT The pristine forest of Bhutan offers valuable prospects for dendrochronological research, which involves investigating past weather conditions and examining how trees grow and regenerate to support the development of sustainable forest management practices. This review presents the dendrochronological research conducted in Bhutan using available literature with the aim to determine the potential of tree species for climate or forest ecological studies and to identify gaps by comparing the methodology, collaboration, and prospects. Based on the systematic review of tree-ring research literature and studies conducted in Bhutan from the 2002 to January 2023, the search yielded a total of 36 dendrochronological studies in Bhutan. Bhutan's first tree-ring research publication studied the relationship between three pine ring-width chronologies and temperature. Bhutan's longest-known tree-ring chronology of 638 years (A.D. 1376 to 2013) from Eastern Himalayan spruce (Picea spinulosa) was used for seasonal and annual temperature reconstructions. Many other tree species of temperate conifer and broadleaved forests are continuously being discovered as potential candidates for use in climate and ecology work in Bhutan. Our review identifies that both national and international collaborations are necessary to conduct robust studies spanning different aspects of dendrochronology including dendrogeomorphology, dendroglaciology, dendroentomology, and dendroseismology to contribute to science and informed decision-making.","PeriodicalId":54416,"journal":{"name":"Tree-Ring Research","volume":"79 1","pages":"41 - 49"},"PeriodicalIF":1.6,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44467843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amy Adams, Richard Krygier, Trisha Hook, Catherine Mcnalty, Jill E. Harvey
Willow trees (Salix alaxensis) growing along the Peel River floodplains near Teetł'it Zheh (Fort McPherson), Northwest Territories, Canada, have been identified as a species of interest because of their impressive height and novel growth form. These willow stands are characterized by tree-form individuals covering 2000–3000 ha. Little research has been directed at understanding the climate–growth relationships of willow in this growth form or region. In this case study, we evaluate the dendrochronological potential of these willows, and assess climate–growth relationships for monthly temperature, precipitation, and SPEI (Standardised Precipitation Evapotranspiration Index) variables. We found that individual trees exhibited a common stand-level pattern of growth variability. Climate–growth correlation analyses indicate willow growth is positively related to May SPEI (r = 0.392) and the mean of June and July maximum temperature (r = 0.341). Willow growth exhibited a negative relationship with May maximum temperature (r = -0.458) and mean June/July SPEI (r = -0.338). These findings suggest there is a general climate response, where willow growth is greater in years with cool, wet springs, and warm, dry summers. Our results provide the first documentation of climate–growth relationships for willow in tree growth form and provide promising preliminary uses of tree-form Salix spp. for dendrochronological analyses.
{"title":"A Case Study: Growth of Tree-Form Willow Driven by Cool, Wet Springs and Warm, Dry Summers in Teetł'it Zheh (Fort Mcpherson), Northwest Territories, Canada","authors":"Amy Adams, Richard Krygier, Trisha Hook, Catherine Mcnalty, Jill E. Harvey","doi":"10.3959/2021-14","DOIUrl":"https://doi.org/10.3959/2021-14","url":null,"abstract":"Willow trees (Salix alaxensis) growing along the Peel River floodplains near Teetł'it Zheh (Fort McPherson), Northwest Territories, Canada, have been identified as a species of interest because of their impressive height and novel growth form. These willow stands are characterized by tree-form individuals covering 2000–3000 ha. Little research has been directed at understanding the climate–growth relationships of willow in this growth form or region. In this case study, we evaluate the dendrochronological potential of these willows, and assess climate–growth relationships for monthly temperature, precipitation, and SPEI (Standardised Precipitation Evapotranspiration Index) variables. We found that individual trees exhibited a common stand-level pattern of growth variability. Climate–growth correlation analyses indicate willow growth is positively related to May SPEI (r = 0.392) and the mean of June and July maximum temperature (r = 0.341). Willow growth exhibited a negative relationship with May maximum temperature (r = -0.458) and mean June/July SPEI (r = -0.338). These findings suggest there is a general climate response, where willow growth is greater in years with cool, wet springs, and warm, dry summers. Our results provide the first documentation of climate–growth relationships for willow in tree growth form and provide promising preliminary uses of tree-form Salix spp. for dendrochronological analyses.","PeriodicalId":54416,"journal":{"name":"Tree-Ring Research","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136229600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
É. Boucher, F. Gennaretti, Trevor J. Porter, Ignacio Hermoso De Mendoza, S. Solignac, Luc Lauzon, J. Axelson, J. Speer, Greg King
3Department of Geography, Geomatics and Environment, University of Toronto Mississauga, Canada 4Université du Québec à Montréal, GEOTOP, Canada 5Université du Québec à Montréal, Centre d’études sur la forêt, Canada 6University of British Columbia, Department of Forest and Conservation Sciences, Canada 7Indiana State University, Department of Earth and Environmental Systems, Canada 8University of Alberta Augustana, Camrose, Alberta, Canada
{"title":"Scientific Meeting ReportAmeridendro 2022 in Montréal, Canada: Reconstructing Our Community","authors":"É. Boucher, F. Gennaretti, Trevor J. Porter, Ignacio Hermoso De Mendoza, S. Solignac, Luc Lauzon, J. Axelson, J. Speer, Greg King","doi":"10.3959/TRR2022-7","DOIUrl":"https://doi.org/10.3959/TRR2022-7","url":null,"abstract":"3Department of Geography, Geomatics and Environment, University of Toronto Mississauga, Canada 4Université du Québec à Montréal, GEOTOP, Canada 5Université du Québec à Montréal, Centre d’études sur la forêt, Canada 6University of British Columbia, Department of Forest and Conservation Sciences, Canada 7Indiana State University, Department of Earth and Environmental Systems, Canada 8University of Alberta Augustana, Camrose, Alberta, Canada","PeriodicalId":54416,"journal":{"name":"Tree-Ring Research","volume":"79 1","pages":"27 - 37"},"PeriodicalIF":1.6,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43810891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liliana Cuapio-Hernández, J. L. Reyes-Ortiz, Amparo Borja De La Rosa, N. Pavón, M. López-Herrera, J. Villanueva‐Díaz, A. Sánchez‐González
ABSTRACT Improving our understanding of the growth dynamics of trees along elevation gradients could help us predict their potential to store carbon and their vulnerability to changes in local and global environmental conditions, such as deforestation and climate change. This study is a review and analysis of the results obtained in recent dendrochronological studies of the effect of elevation and climate (temperature and precipitation) on the radial growth of trees in temperate zones, mainly in the Northern Hemisphere. Only 18 (32.1%) of the 56 studies analyzed found a correlation between radial growth of the trees (total chronologies) and elevation. The analysis of 56 chronologies of 46 tree species included in the 110 works reviewed, showed that only in 28.2% of them the correlation between radial growth versus temperature and precipitation was significant: positive in 3.6%, negative in 2.7%, and positive and negative in 21.8%, depending on the season of the year. The wide variation found in the radial growth response of the trees to elevation gradients may be related to multiple environmental factors at a local or regional scale, but also to the different sampling methods used in the studies. However, a moderate proportion of the studies analyzed (close to 30%) show that temperature and rainfall are related to trends in radial growth in different elevation ranges and regions of the world.
{"title":"Is There a Response Pattern between Radial Growth of Trees and Elevation Gradient?","authors":"Liliana Cuapio-Hernández, J. L. Reyes-Ortiz, Amparo Borja De La Rosa, N. Pavón, M. López-Herrera, J. Villanueva‐Díaz, A. Sánchez‐González","doi":"10.3959/TRR2021-19","DOIUrl":"https://doi.org/10.3959/TRR2021-19","url":null,"abstract":"ABSTRACT Improving our understanding of the growth dynamics of trees along elevation gradients could help us predict their potential to store carbon and their vulnerability to changes in local and global environmental conditions, such as deforestation and climate change. This study is a review and analysis of the results obtained in recent dendrochronological studies of the effect of elevation and climate (temperature and precipitation) on the radial growth of trees in temperate zones, mainly in the Northern Hemisphere. Only 18 (32.1%) of the 56 studies analyzed found a correlation between radial growth of the trees (total chronologies) and elevation. The analysis of 56 chronologies of 46 tree species included in the 110 works reviewed, showed that only in 28.2% of them the correlation between radial growth versus temperature and precipitation was significant: positive in 3.6%, negative in 2.7%, and positive and negative in 21.8%, depending on the season of the year. The wide variation found in the radial growth response of the trees to elevation gradients may be related to multiple environmental factors at a local or regional scale, but also to the different sampling methods used in the studies. However, a moderate proportion of the studies analyzed (close to 30%) show that temperature and rainfall are related to trends in radial growth in different elevation ranges and regions of the world.","PeriodicalId":54416,"journal":{"name":"Tree-Ring Research","volume":"79 1","pages":"12 - 26"},"PeriodicalIF":1.6,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44004221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Kasatkina, O. Shumilov, M. Timonen, Evgeniy O. Potorochin
ABSTRACT To investigate the possible Sun–climate connection during the Holocene, the Finnish super-long tree-ring chronology covering the period from 5634 B.C. to A.D. 2004 was analyzed. As an indicator of solar activity, we used a reconstruction of total solar irradiance (TSI) covering 9300 years, which is based on a composite using the cosmogenic radionuclide 10Be measured in polar ice cores, and also on neutron monitor data (Steinhilber et al. 2009). The Multiple Taper Method (MTM) wavelet decomposition and wavelet coherence analyses were applied to the time-series. The MTM spectral analysis identifies the main solar cycles at ca. 200 yr (de Vries or Suess), ca. 350 yr (unnamed) and ca. 900 years (Eddy). The strongest cross-wavelet correlation was discovered between the millennium-cycle components of TSI and tree-ring width variations. This Eddy cycle, which was recently discovered in solar activity, remains both strong and stable through almost the entire Holocene, and it reappears again at lower frequencies (ca. 1300 years) after ca. A.D. 200. Our results raise questions regarding the end of the Holocene and transition to the next glacial period and confirm the complex and nonlinear nature of the Sun–climate relationship during the Holocene Epoch.
{"title":"Millennial-Scale Solar Variability in Tree Rings of Northern Fennoscandia at the End of the Holocene","authors":"E. Kasatkina, O. Shumilov, M. Timonen, Evgeniy O. Potorochin","doi":"10.3959/TRR2022-4","DOIUrl":"https://doi.org/10.3959/TRR2022-4","url":null,"abstract":"ABSTRACT To investigate the possible Sun–climate connection during the Holocene, the Finnish super-long tree-ring chronology covering the period from 5634 B.C. to A.D. 2004 was analyzed. As an indicator of solar activity, we used a reconstruction of total solar irradiance (TSI) covering 9300 years, which is based on a composite using the cosmogenic radionuclide 10Be measured in polar ice cores, and also on neutron monitor data (Steinhilber et al. 2009). The Multiple Taper Method (MTM) wavelet decomposition and wavelet coherence analyses were applied to the time-series. The MTM spectral analysis identifies the main solar cycles at ca. 200 yr (de Vries or Suess), ca. 350 yr (unnamed) and ca. 900 years (Eddy). The strongest cross-wavelet correlation was discovered between the millennium-cycle components of TSI and tree-ring width variations. This Eddy cycle, which was recently discovered in solar activity, remains both strong and stable through almost the entire Holocene, and it reappears again at lower frequencies (ca. 1300 years) after ca. A.D. 200. Our results raise questions regarding the end of the Holocene and transition to the next glacial period and confirm the complex and nonlinear nature of the Sun–climate relationship during the Holocene Epoch.","PeriodicalId":54416,"journal":{"name":"Tree-Ring Research","volume":"79 1","pages":"1 - 11"},"PeriodicalIF":1.6,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44080444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. A. Copenheaver, Saskia L. van de Gevel, Adam K. Downing, T. A. Coates
ABSTRACT Dendrochronologists regularly host conferences and workshops to share tree-ring research and new methodologies. Unfortunately, national and international scientific gatherings have also historically been events where some female researchers have experienced sexual harassment, discrimination, and assault. The objective of this project was to host a focus group with experienced conference and workshop organizers to gather best practices and policies to reduce the risk of sexual misconduct at these events. A concerted effort by organizers is needed, and this begins with the development of a diverse and inclusive organizing committee. Organizers will need to craft a sexual misconduct policy that includes a clear definition, a violation reporting system with multiple reporting pathways, a review process, an enforcement system with penalties for the violator, and supportive resources for victims. Currently, the Tree-Ring Society offers organizers of workshops and conferences a definition of sexual misconduct and possible penalties for violations; however, the dendrochronology discipline currently lacks a reporting system, formalized review system, and resources for victims. We hope sharing the results of this focus group will allow future conference and workshop organizers to implement these findings and provide a safe environment for all dendrochronologists.
{"title":"Reducing the Risk of Sexual Misconduct at Dendrochronology Conferences and Workshops","authors":"C. A. Copenheaver, Saskia L. van de Gevel, Adam K. Downing, T. A. Coates","doi":"10.3959/2022-1","DOIUrl":"https://doi.org/10.3959/2022-1","url":null,"abstract":"ABSTRACT Dendrochronologists regularly host conferences and workshops to share tree-ring research and new methodologies. Unfortunately, national and international scientific gatherings have also historically been events where some female researchers have experienced sexual harassment, discrimination, and assault. The objective of this project was to host a focus group with experienced conference and workshop organizers to gather best practices and policies to reduce the risk of sexual misconduct at these events. A concerted effort by organizers is needed, and this begins with the development of a diverse and inclusive organizing committee. Organizers will need to craft a sexual misconduct policy that includes a clear definition, a violation reporting system with multiple reporting pathways, a review process, an enforcement system with penalties for the violator, and supportive resources for victims. Currently, the Tree-Ring Society offers organizers of workshops and conferences a definition of sexual misconduct and possible penalties for violations; however, the dendrochronology discipline currently lacks a reporting system, formalized review system, and resources for victims. We hope sharing the results of this focus group will allow future conference and workshop organizers to implement these findings and provide a safe environment for all dendrochronologists.","PeriodicalId":54416,"journal":{"name":"Tree-Ring Research","volume":"78 1","pages":"140 - 149"},"PeriodicalIF":1.6,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49148186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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